Revtronic 1600 Lumens Bike Light - Cree LED Bike Lights - Mountain Bike Headlight Bundle with 5200mAh Rechargeable Battery Pack, AC Charger GET MORE CONFIDENCE SAFELY AND SECURELY WHEN NIGHT RIDING - The Revtronic BT40S provides a respectable 1600 lumens output, turns night into day while you commute. The bike light is perfect for cyclist in need of bright lights for poorly illuminated urban street and dark cycle lanes. Most of the fatal cycling acidents happen at night due to lack of vision. Avoid becoming another statistic with our ultral powerful bike light! BOASTS 4 DIFFERENT INTENSITY MODES - The Revtronic BT40S light for bike features 4 brightness level: 1600lumens/1200lumens/800lumens/480lumens. The Revtronic BT40S LED bike light uses high quality optical lens with a wide-beam-angle, offers smooth, comfortable and excellent beam throw, you will NOT feel visual fatigue after a long riding. SUPER LONG BATTERY LIFE SAVES YOUR TIME AND MONEY ON BATTERIES - The Revtronic BT40S bicycle light powered by 7.4V 5.2Ah Rechargeable Battery Pack, runs 3 hours on High and 12.8 hours on Low, perfect for night riding. The Revtronic BT40S headlight also features battery indicator, displays remaining battery capacity from the LED indicator at the back of the light. Red or Red blink warning low battery power. IDEAL ILLUMINATION GEAR FOR MOUNTAIN BIKING/TOURING/COMMUTING - The Revtronci BT40S features high quality PMMA optical lens that provides wide and smooth beam which is the most comfortable optical system for ninght cycling. Plus white LED, cyclist will feel less visual fatigue after a long riding. The BT40S bike light also features digitally regulated output which can provide maintains constant brightness,the overheat protection function will protect your bike light. TROUBLESHOOTING TO MAKE SURE YOU USE THE LIGHT CORRECTLY - If the light can not turn on 1) Please charging the battery and make sure the charger shows the battery fully charged; 2) Please check the cable connection between the headlight and battery pack, make sure it is not loosen;3) Please click the tail button of the headlight to turn on the light.